Abstract
Catalytic dewaxing is performed with a catalyst based on high-silica zeolites of the TsVM type, with a preassigned pore structure; high-freezing straight-chain paraffinic hydrocarbons can be removed from straight-run diesel distillates by means of this process. In the studies reported here, they used a straight-run 200-360/sup 0/C diesel fuel cut from medium-sulfur mixed West Siberian crudes, and also the same cut after hydrotreating. These cuts corresponded in distillation range to standard summer-grade diesel fuels, and they contained approximately 20% straight-chain paraffinic hydrocarbons. Three different schemes were used in performing the experiments: single-step, without any preliminary hydrotreating of the feed; single-step two-stage, with hydrotreating catalysts charged to the first reactor, and with the gas-product mixture form the first stage fed to the dewaxing stage without any intermediate fractionation; and two-step, with hydrotreating of the feed in the first step.
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